The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 18, 2000
Filed:
May. 22, 1998
Kensuke Sawase, Kyoto, JP;
Rohm Co., Ltd., Kyoto, JP;
Abstract
An EEPROM device has an array of memory cells composed of nonvolatile data-storage elements that allow electrical writing and erasing of data. The array of memory cells is provided with an area for storing data representing the length of writing time for which the writing and erasing of data are performed. The writing-time data is read out from this area and held in a latch circuit. The latched data is used as the target count up to which a counter counts a clock. The counter starts counting in response to a start signal and stops counting when the actual count reaches the target count. The counter, while it is counting, outputs a high-level signal, which determines the length of writing time for which writing is performed in the memory cells.